I need some help on viewport animation.

I'm currently making the animation of a CNC machine and all is going well
except concerning the viewport animation. Lets see...
At first I wrongly thought that I could pass parameters from modules to
$vpr, $vpt and $vpd using $globals. As this is impossible, I tried using
functions at top level to do the same.

for instance if I do:
$vpt=[100+300MT(1),0,0];
$vpr=[0,0,200MT(1)];
$vpd=1500;
where MT(i) function is the relative time within animation sequence "i" and
depends on $t, the viewport animates.

However if I do:

function Cam() = CS==1 ? [10,200,1, 20,20,1, 20,20,1, 20,92,2, 20,29,1,
20,92,2, 200,200,1] :
CS==2 ? [10,200,1, 20,20,1, 20,20,1, 29,92,2, 29,29,1, 29,92,2,
200,200,1] : 0 ;

Where CS is my current sequence and Cam() contains the parameters for the
viewport animation.

And then if I do:

function VPX(CS)=Cam()[0]+S(CS,Cam()[1],Cam()[2],0);
function VPRZ(CS)=Cam()[15]+S(CS,Cam()[16],Cam()[17],0);

Where my function S(a,b,c,d), that is systematically used in my animation
without problems, also depends on $t.

And then do:

$vpt=[VPX(CS), 100, 100];
$vpr=[0,0,VPRZ(CS)];
$vpd=1500;

echo("Camera: ", Cam()[0],Cam()[1], Cam()[2],VPX(CS), VPRZ(CS));

I see that VPX(CS) and VPRZ(CS) change with time as expected, but $vpt and
$vpr stay with the first calculated values until the end of the sequence.

What am I doing wrong?

Thanks.

jpmendes

--
View this message in context: http://forum.openscad.org/Help-on-viewport-animation-tp16858.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

Don't know what's wrong, but if you can rotate the objects (instead of
changing viewport), this might be useful:

Animating gif with 3D rotation
http://forum.openscad.org/Animating-gif-with-3D-rotation-td14011.html

$  Runsun Pan, PhD $ libs: doctest , faces ( git ), offline doc ( git ), runscad.py( 1 , 2 , git ), synwrite( 1 , 2 );  $ tips: hash( 1 , 2 ), matrix( 1 , 2 ),sweep( 1 , 2 ), var( 1 , 2 ), lerp , animation ( gif , prodVid ), precision( 1 , 2 ), xl-control , type , rounded polygon , chfont

--
View this message in context: http://forum.openscad.org/Help-on-viewport-animation-tp16858p16860.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

@ Doug
Nope, there is only one place where $vp's are referenced.

@ nopehead
I tried Cam(CS) without success.

Thanks anyway

BTW this is a test sample of the two first sequences without the CNC, just
to speed up things. Although there are some adjustments to be done, that's
the idea.

anima_tst.mp4 http://forum.openscad.org/file/n16866/anima_tst.mp4

Another problem I'm facing is: for this simple animation, generating the
png's directly by checking "Dump Pictures"  my file rate generation is about
1 second per picture. However if I use a script for generating the images
with about 4x the standard resolution, it takes about a minute per picture.
That means more than 2 days for my estimated 7500 steps animation.
Considering the inclusion of all the components in the animation maybe a
week will not be enough. The CNC is belt driven and I have to calculate the
belt deformation for each step, and it takes about 20 secs in my machine.

--
View this message in context: http://forum.openscad.org/Help-on-viewport-animation-tp16858p16866.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

@jpmendes I'm happy to help out with rendering a sequence.
I have 16 cores, possibly more than one instance can be rendered at the same
time ?
Assuming you hve a time constraint....

--
View this message in context: http://forum.openscad.org/Help-on-viewport-animation-tp16858p16867.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

@neon22
Thanks, I may consider the offer for the final render. Maybe I can use my
son's 6 core pc if he takes some days off, summer is comming ... :-).  For
now I have my 11 year old, 2 cores Athlon 4200 only.

@nopehead

My S function is a bit straight forward. I intend to perfect it later. Now
what I'm trying to do is  a simple animator that I can use whenever I need.

// S -Relative speed within the sequence time with movement inversion point
(perliminary).
// d - distance, s - relative speed, InvT - inversion point between 1 and 0.
function S(i,d,s,InvT) = (InvT==undef)? (dpow(MT(i),s)):
(MT(i)-InvT<0)? (dpow(-MT(i)+InvT,s)):
(d*pow(MT(i)-InvT,s));

// MT - relative time within the sequence time slot (1 --> 0)
function MT(i) = (T(i)-$t>=0)? (TTime/SeqTPlan[i-1])*(T(i)-$t): 0;

As you can see S() depends on $t through MT(i)

--
View this message in context: http://forum.openscad.org/Help-on-viewport-animation-tp16858p16870.html
Sent from the OpenSCAD mailing list archive at Nabble.com.

Yes you are right MT() has a bug. Problem solved. But I cheated a bit.
My real MT(i) was:

function MT(i) = ($ST>1||$ST<0)? 0 : ($tst==0)? NT(i) : ($ST==undef)? 1 :
$ST;

and NT(i) is the MT(i) function I posted before.

function NT(i) = (T(i)-$t>=0)? (TTime/SeqTPlan[i-1])*(T(i)-$t): 0;

Since my variable $tst is set to 0,  I replaced directly NT(i)  with MT(i)
for posting simplification.
My MT(i) was a debugging help to test animation sequences without the
animation mode checked.
The problem is that I forgot that $ST is undef when I am not in test mode
and probably the evaluation of the expression is in such a way that $ST is
evaluated before $tst, and as a result MT(i) is always 1.
The reason for the globals was that I was hopping to pass values from
modules to the top level but that's not possible.

Thanks a lot for the help.
jpmendes

--
View this message in context: http://forum.openscad.org/Help-on-viewport-animation-tp16858p16872.html
Sent from the OpenSCAD mailing list archive at Nabble.com.